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Luminaires with high in-rush

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    Luminaires with high in-rush

    I'm working on an installation of luminaires that have electronic power supplies that create a large inrush current at turn-on. A typical string of lights on a 20A branch circuit (277V) would create an inrush of 300A for 8.3ms (1/2 cycle).

    Is a high-inrush type of CB the best solution (assuming I can't change the luminaire power supply, split the circuit, etc.)?

    What CB brands and types are easiest to find?

    I have been looking at a Heinemann AMR type (one of their curves goes to 30X rating for inrush), BUT it seems everyone only stocks them in UL1077 types rather than UL489. I need UL489.

    I'm seeing more and more solid state lighting and some have low inrush and some have high inrush - it seems that this must be getting to be a more common problem as lighting migrates to electronic drivers.

    Thanks for any thoughts.

    #2
    Welcome to the forum!

    I wonder whether an HACR breaker would suffice, or even a standard SWD rated one?
    Master Electrician
    Electrical Contractor
    Richmond, VA

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      #3
      look at the 'high magnetic' version of square D QO, for example QO120HM for 20 amp single pole.

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        #4
        oops, i reread and saw the application is 277v. I know the square D EDB breakers for the NF panelboards are rated for HID lighting (high inrush) http://static.schneider-electric.us/...O9602R1197.pdf

        Even if you got the Eaton AMR breakers you want, what are you going to put them in?

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